Android 两个Service的相互监视实现代码

2019-12-12 05:04:14

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两个Service之间相互监视的实现

在实际开发中可能需要用到两个Service相互监视的情况，本示例就是实现此功能以作参考。

服务A：

public class ServiceA extends Service {  private static final String TAG = ServiceA.class.getSimpleName();  MyBinder mBinder;  MyServiceConnection mServiceConnection;  PendingIntent mPendingIntent;  @Override  public void onCreate() {    super.onCreate();    if(mBinder==null)    {      mBinder=new MyBinder();    }    mServiceConnection=new MyServiceConnection();  }  @Override  public int onStartCommand(Intent intent, int flags, int startId) {    ServiceA.this.bindService(new Intent(ServiceA.this,ServiceB.class),mServiceConnection, Context.BIND_IMPORTANT);    mPendingIntent=PendingIntent.getService(this,0,intent,0);    Notification.Builder builder=new Notification.Builder(this);    builder.setTicker("守护服务A启动中")        .setContentText("我是来守护服务B的")        .setContentTitle("守护服务A")        .setSmallIcon(R.mipmap.ic_launcher)        .setContentIntent(mPendingIntent)        .setWhen(System.currentTimeMillis());    Notification notification=builder.build();    startForeground(startId,notification);    return START_STICKY;  }  @Override  public IBinder onBind(Intent intent) {    return mBinder;  }  public class MyBinder extends IBridgeInterface.Stub {    @Override    public String getName() throws RemoteException {      return "name:"+TAG;    }  }  class MyServiceConnection implements ServiceConnection {    @Override    public void onServiceConnected(ComponentName componentName, IBinder iBinder) {      String name=null;      try {        name= IBridgeInterface.Stub.asInterface(iBinder).getName();      } catch (RemoteException e) {        e.printStackTrace();      }      Toast.makeText(ServiceA.this,name+"连接成功",Toast.LENGTH_SHORT).show();    }    @Override    public void onServiceDisconnected(ComponentName componentName) {      Toast.makeText(ServiceA.this,TAG+"断开连接",Toast.LENGTH_SHORT).show();      ServiceA.this.startService(new Intent(ServiceA.this,ServiceB.class));      ServiceA.this.bindService(new Intent(ServiceA.this,ServiceB.class),mServiceConnection, Context.BIND_IMPORTANT);    }  }}

服务B：

public class ServiceB extends Service {  private static final String TAG = ServiceB.class.getSimpleName();  private PendingIntent mPendingIntent;  private MyBinder mBinder;  private MyServiceConnection mServiceConnection;  @Override  public IBinder onBind(Intent intent) {    return mBinder;  }  @Override  public void onCreate() {    super.onCreate();    if (mBinder == null) {      mBinder = new MyBinder();    }    mServiceConnection = new MyServiceConnection();  }  @Override  public int onStartCommand(Intent intent, int flags, int startId) {    this.bindService(new Intent(ServiceB.this, ServiceA.class), mServiceConnection, Context.BIND_IMPORTANT);    mPendingIntent = PendingIntent.getService(this, 0, intent, 0);    Notification.Builder builder = new Notification.Builder(this);    builder.setTicker("守护服务B启动中")        .setContentText("我是来守护服务A的")        .setContentTitle("守护服务B")        .setSmallIcon(R.mipmap.ic_launcher)        .setContentIntent(mPendingIntent)        .setWhen(System.currentTimeMillis());    Notification notification = builder.build();    startForeground(startId, notification);    return START_STICKY;  }  public class MyBinder extends IBridgeInterface.Stub {    @Override    public String getName() throws RemoteException {      return "name:"+TAG;    }  }  class MyServiceConnection implements ServiceConnection {    @Override    public void onServiceConnected(ComponentName componentName, IBinder iBinder) {      String name=null;      try {        name=IBridgeInterface.Stub.asInterface(iBinder).getName();      } catch (RemoteException e) {        e.printStackTrace();      }      Toast.makeText(ServiceB.this, name + "连接成功", Toast.LENGTH_SHORT).show();    }    @Override    public void onServiceDisconnected(ComponentName componentName) {      Toast.makeText(ServiceB.this, TAG + "断开连接", Toast.LENGTH_SHORT).show();      ServiceB.this.startService(new Intent(ServiceB.this, ServiceA.class));      ServiceB.this.bindService(new Intent(ServiceB.this, ServiceA.class), mServiceConnection, Context.BIND_IMPORTANT);    }  }}

IBridgeInterface.aidl

1 interface IBridgeInterface {2   String getName();3 }

界面：

public class MainActivity extends Activity {  @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    startService(new Intent(this, ServiceA.class));    startService(new Intent(this, ServiceB.class));  }}

AndroidManifest.xml

<service android:name=".services.ServiceA" />    <service      android:name=".services.ServiceB"       android:process=":remote" />

由于涉及到跨进程，onServiceConnected() 方法中使用

IBridgeInterface.Stub.asInterface(iBinder).getName();
而不能直接类型转换

((ServiceA.MyBinder)iBinder).getName();

onStartCommand

onStartCommand() 方法必须返回整型数。整型数是一个值，用于描述系统应该如何在服务终止的情况下继续运行服务。

返回的值必须是以下常量之一：

START_NOT_STICKY

　　如果系统在 onStartCommand() 返回后终止服务，则除非有挂起 Intent 要传递，否则系统不会重建服务。

START_STICKY

　　如果系统在 onStartCommand() 返回后终止服务，则会重建服务并调用 onStartCommand()，但绝对不会重新传递最后一个 Intent。相反，除非有挂起 Intent 要启动服务（在这种情况下，将传递这些 Intent ），否则系统会通过空 Intent 调用 onStartCommand()。这适用于不执行命令、但无限期运行并等待作业的媒体播放器（或类似服务）。

START_REDELIVER_INTENT

　　如果系统在 onStartCommand() 返回后终止服务，则会重建服务，并通过传递给服务的最后一个 Intent 调用 onStartCommand()。任何挂起 Intent 均依次传递。这适用于主动执行应该立即恢复的作业（例如下载文件）的服务。

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